/**
 * @(#) $RCSfile: MouseEngineInit.as,v $ $Revision: 1.4 $ $Date: 2003/01/29 16:40:19 $
 *
 * Copyright 2003 Orgdot AS. All Rights Reserved.
 * http://dev.swfit.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/**
 * This script prepares the different aspects of the mouse engine. The user must input:
 * clip_width, clip_height, clip_x, clip_y, delay, acceleration and friction, or they will be 
 * given default values. Regarding the cliprect, this will be based on the default flash
 * movie size 550x400 (which very likely will be wrong, so remember to set the size in the 
 * flash movie). See MouseEngineLoop for further details.
 *
 * @author      Olaf Havnes
 * @version     $Revision: 1.4 $ $Date: 2003/01/29 16:40:19 $
 * @since       SWFIT1.0
 */

DEFAULT_CLIP_X = 50;
DEFAULT_CLIP_Y = 50;

DEFAULT_CLIP_WIDTH  = 550 - DEFAULT_CLIP_X * 2;
DEFAULT_CLIP_HEIGHT = 400 - DEFAULT_CLIP_Y * 2;


x_min = clip_x    ne "" ? clip_x      : DEFAULT_CLIP_X;
y_min = clip_y    ne "" ? clip_y      : DEFAULT_CLIP_Y;

cw = clip_width   ne "" ? clip_width  : DEFAULT_CLIP_WIDTH;
ch = clip_height  ne "" ? clip_height : DEFAULT_CLIP_HEIGHT;

x_cnt = x_min + cw / 2;
y_cnt = y_min + ch / 2;

x_max = x_min + cw;
y_max = y_min + ch;


// values for the bouncing mouse tracker
DEFAULT_ACCELERATION = 0.5;
DEFAULT_FRICTION     = 0.1;


fr = friction     ne "" ? friction     : DEFAULT_FRICTION;
ac = acceleration ne "" ? acceleration : DEFAULT_ACCELERATION;

// used for delayed mouse tracking
DEFAULT_DELAY = 10;
dl = delay ne "" ? delay : DEFAULT_DELAY;


// some values for the simple camera model
DEFAULT_CAMERA_ROLL = 0;
croll = camera_roll ne "" ? camera_roll: DEFAULT_CAMERA_ROLL;

DEFAULT_CAMERA_DEPTH = 3;
cdepth = camera_depth ne "" ? camera_depth : DEFAULT_CAMERA_DEPTH;
cam_z = Math.sqrt (cdepth * cdepth - 2);

// save some divisions and multiplications later
cam_len_sq = cdepth * cdepth;

cr_2 = croll / 2;
cw_2 = cw / 2;
ch_2 = ch / 2;

xwa = - (x_min + cw_2) / cw_2;
ywa =   (y_min + ch_2) / ch_2;

// the radius of the camera back wall (45 degrees)
cos_max_cangle = 0.5;

// precompute some values and store at _level0 for other scripts
/:cisect = cam_len_sq * cos_max_cangle * cos_max_cangle;
/:cam_len_sq = cam_len_sq;
/:cam_len = cam_z;

// neded later
xh = 1;
yv = 1;

// set the ball rolling
startDrag ("", true);